div.overflow_1{
    width: 300px;
    height: 100px;
    border: 1px solid red;
    overflow:hidden;
}

div.overflow_2{
    width: 100px;
    height: 100px;
    border: 1px solid #aabbcc;
    font-size: 250%;
    overflow: auto;
}

.box{

    width: 400px;
    height: 50px;
    margin-top: 10px;
    border: 3px solid #23ce70;
    background-color: rgb(235, 230, 230);
}

.pos_static{
    position: static;
    background-color: bisque;
}
.pos_relative{
    background-color: rgb(248, 178, 246);
    position: relative;
    left: 20px;
    top: 20px;
    z-index: -100;
}
.pos_fixed{
    position: fixed;
    background-color: #72a486;
    top:0;
    right: 0; 
}

.pos_absolute{
    position: absolute;
    background-color: rgb(135, 60, 60);
    top: 100px;
    left: 200px;
}
.menu:hover +.absolute_menu{
    display: block;
}
.absolute_menu{
    background-color: hotpink;
    position: absolute;
    display: none;
    top:46px;
    left: 0px;
}
.pos_sticky{
    position: sticky;
    position: -webkit-sticky;
    background-color: #add;
    bottom: 100px;
    margin-left: 300px;
}

/* 浮动 */
.layout6 > div{
    float: left;
    background: #d7e68c;
    border-radius: 5px;
    margin: 5px;
}
.layout6 .box2{
    float: right;
}
